<HTML>
<head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
</HEAD>
<BODY>
<select onchange="alert('select onchange event');" id="select1">
    <option>1</option>
    <option>2</option>
</select>
<INPUT TYPE="button" value="按这" onclick="clickButton()">
<script type="text/javascript">
    function clickButton() {
        alert("click button");
        var t = document.getElementById('select1')
        if (document.all) {
            t.fireEvent("onchange");
            alert("ie");
        }
        else {
            var evt = document.createEvent('HTMLEvents');
            evt.initEvent('change', true, true);
            t.dispatchEvent(evt);
        }
    }
</script>
按button也会发出option的select事件
</BODY>
</HTML>
